The Siege of Osaka(大坂の役,Ōsaka no Eki?, or, more commonly, 大坂の陣 Ōsaka no Jin) was a series of battles undertaken by the Tokugawa shogunate against the Toyotomi clan, and ending in that clan's destruction. Divided into two stages (Winter Campaign and Summer Campaign), and lasting from 1614 to 1615, the siege put an end to the last major armed opposition to the shogunate's establishment. The end of the conflict is sometimes called the Genna Armistice (元和偃武,Genna Enbu?), because the era name was changed from Keichō to Genna immediately following the siege.

In 1614, the Toyotomi clan rebuilt Osaka Castle. At the same time, the head of the clan sponsored the rebuilding of Hōkō-ji in Kyoto. These temple renovations included the casting of a great bronze bell, with inscriptions that read "May the state be peaceful and prosperous" (国家安康 kokka ankō), and "May noble lord and servants be rich and cheerful" (君臣豊楽 kunshin hōraku). The shogunate interpreted "kokka ankō" (国家安康) as shattering Ieyasu's name (家康) to curse him, and also interpreted "kunshin hōraku" (君臣豊楽) to mean "Toyotomi's force (豊臣) will rise again," which meant treachery against the shogunate. Tensions began to grow between the Tokugawa and the Toyotomi clans, and only increased when Toyotomi Hideyori began to gather a force of ronin and enemies of the shogunate in Osaka. By November of that year, Ieyasu, despite having passed the title of Shogun on to his son in 1605, nevertheless maintained significant influence, and decided not to let this force grow any larger, leading 164,000 men to Osaka (the count does not include the troops of Shimazu Tadatsune, an ally of the Toyotomi cause who nevertheless did not send troops to Osaka).

Setup of winter campaign, November 1614

The siege began on the 19th of November, when Ieyasu led three thousand men across the Kizu River, destroying the fort there. A week later, he attacked the village of Imafuku with 1,500 men, against a defending force of 600. With the aid of a squad wielding arquebuses, the shogunate forces claimed another victory. Several more small forts and villages were attacked before the siege on Osaka Castle itself began on 4 December.

The Sanada-maru was an earthwork barbican defended by Sanada Yukimura and 7,000 men, on behalf of the Toyotomi. The Shogun's armies were repeatedly repelled, and Sanada and his men launched a number of attacks against the siege lines, breaking through thrice. Ieyasu then resorted to artillery (including 17 imported European cannons and 300 domestic wrought iron cannons) as well as men to dig under the walls. On 22 January the Winter Siege was ended, with Toyotomi Hideyori pledging to not rise in rebellion. The walls of the outer layer defenses were torn down, and the outer moat of Osaka castle was allowed to be filled in.

In April 1615, Ieyasu received word that Toyotomi Hideyori was gathering even more troops than in the previous November, and that he was trying to stop the filling of the moat.[citation needed] Toyotomi forces (often called the Western Army) began to attack contingents of the Shogun's forces (the Eastern Army) near Osaka.[citation needed]

On June 2 (Keichō 20, 6th day of 5th month), the battle of Dōmyōji took place. Osaka forces were trying to stop the Tokugawa forces approaching from Yamato Province along the Yamato-gawa river. Two of Osaka generals: Gotō Matabei and Susukida Kanesuke were killed in action. Osaka forces commander Sanada Yukimura engaged in a battle with Date Masamune forces, but soon retreated towards Osaka Castle. Tokugawa forces did not pursue Sanada.

The same day Chōsokabe Morichika and Tōdō Takatorabattled at Yao. Another battle took place at Wakae around the same time, between Kimura Shigenari and Ii Naotaka. Chōsokabe's forces achieved victory, but Kimura Shigenari was deflected by the left wing of Ii Naotaka's army. The main Tokugawa forces moved to assist Todo Takatora after Shigenari's death, and Chōsokabe withdrew for the time being.

After another series of shogunate victories on the outskirts of Osaka, the Summer Campaign came to a head at the battle of Tennōji. Hideyori planned a hammer-and-anvil operation, in which 55,000 men would attack the center of the Eastern Army, while a second force, of 16,500 men, would flank them from the rear led by Kyōgoku Tadataka, Ishikawa Tadafusa and Kyōgoku Takatomo.[1] Another contingent waited in reserve. Ieyasu's army was led by his son, the Shogun Tokugawa Hidetada, and numbered around 155,000. They moved in four parallel lines, prepared to make flanking maneuvers of their own. Mistakes on both sides nearly ruined the battle, as Hideyori's ronin split off from the main group, and Hidetada's reserve force moved up without orders from the main force.

In the end, however, Hideyori's commander Sanada Yukimura was killed, destroying the morale of the Western Army. The smaller force led directly by Hideyori sallied forth from Osaka Castle too late, and was chased right back into the castle by the advancing enemies; there was no time to set up a proper defense of the castle, and it was soon ablaze and pummeled by artillery fire. Hideyori committed seppuku, and the final major uprising against Tokugawa rule was put to an end, leaving the shogunate unchallenged for approximately 250 years.

According to an account by an employee of the Dutch East India Company in Hirado, several daimyō set the castle on fire and attempted to defect to Ieyasu. Hideyori executed them by throwing them off the castle wall but could not extinguish the fire, causing his suicide. The account also stated that about 10,000 people died.[2] History indicates that the legendary swordsman Miyamoto Musashi participated in the battle on the Toyotomi side, though he has no recorded accomplishments in this battle.

Hideyori's son Toyotomi Kunimatsu (age 8) was captured by the shogunate and beheaded in Kyoto. According to legend, before his beheading, little Kunimatsu bravely blamed Ieyasu for his betrayal and brutality against Toyotomi clan. Naahime, daughter of Hideyori, was not sentenced to death. She later became a nun at Kamakura's Tōkei-ji. Hideyoshi's grave was destroyed by the shogunate, along with Kyoto's Toyokuni Shrine. Chōsokabe Morichika was beheaded on May 11 while his gang member Ono Harunaga, who was wanted for over 10 years, was killed on June 27. There are also records of pillaging and mass rapes by Tokugawa forces at the closing of the siege.

One of the oldest kawaraban newsprints sold during the Edo period, depicting the fall of Osaka Castle

The bakufu obtained 650,000 koku at Osaka and started rebuilding Osaka Castle. Osaka was then made a han (feudal domain), and given to Matsudaira Tadayoshi. In 1619, however, the shogunate replaced Osaka Domain with Osaka Jodai, placed under the command of a bugyō who served the shogunate directly; like many of Japan's other major cities, Osaka was for the remainder of the Edo period not part of a han under the control of a daimyō. A few daimyō including Naitō Nobumasa (Takatsuki Castle, Settsu Province 20,000 koku) and Mizuno Katsushige (Yamato Koriyama, Yamato Province 60,000 koku) moved to Osaka.

After the fall of the castle, the shogunate announced laws including ikkoku ichijō(一国一城?)[3] (one province can contain only one castle) and Bukeshohatto (or called Law of Buke, which limits each daimyō to own only one castle and obey the castle restrictions). The shogunate's permission had to be obtained prior to any castle construction or repair from then on. Many castles were also forced to be destroyed as a result of compliance with this law.

Despite finally uniting Japan, Ieyasu's health was failing. During the one-year campaign against the Toyotomi clan and its allies, he received wounds that significantly shortened his life. Roughly one year later on June 1, 1616, Tokugawa Ieyasu, the third and last of the great unifiers, died at the age of 75, leaving the shogunate to his descendants.

The fall of Osaka is (for most of the characters) the final level in the Samurai Warriors series, also serving as the climax of Hattori Hanzo's, Ieyasu's and Yukimura's stories. Called the "Osaka Campaign", it compiles all the battles of the Winter and Summer Campaigns.